linux-kernel - Re: [PATCH V2 2/2] serial: 8250_omap: Fix gpio check for auto RTS/CTS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAGm1_kuoZ_sMDut7X_BGycsPYnb7J3K8_RWw+FdTJcYjCPjtrA@mail.gmail.com>
Date:   Sun, 6 Oct 2019 20:11:32 +0200
From:   Yegor Yefremov <yegorslists@...glemail.com>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vignesh R <vigneshr@...com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Douglas Anderson <dianders@...omium.org>,
        Tony Lindgren <tony@...mide.com>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/2] serial: 8250_omap: Fix gpio check for auto RTS/CTS

On Sun, Oct 6, 2019 at 6:33 PM Adam Ford <aford173@...il.com> wrote:
>
> There are two checks to see if the manual gpio is configured, but
> these the check is seeing if the structure is NULL instead it
> should check to see if there are CTS and/or RTS pins defined.
>
> This patch uses checks for those individual pins instead of
> checking for the structure itself to restore auto RTS/CTS.
>
> Signed-off-by: Adam Ford <aford173@...il.com>

Reviewed-by: Yegor Yefremov <yegorslists@...glemail.com>

> ---
> V2:  Made the NULL dererence check from patch 1/2 come before this.
>
> diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
> index c68e2b3a1634..836e736ae188 100644
> --- a/drivers/tty/serial/8250/8250_omap.c
> +++ b/drivers/tty/serial/8250/8250_omap.c
> @@ -141,7 +141,7 @@ static void omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
>
>         serial8250_do_set_mctrl(port, mctrl);
>
> -       if (!up->gpios) {
> +       if (!mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS)) {
>                 /*
>                  * Turn off autoRTS if RTS is lowered and restore autoRTS
>                  * setting if RTS is raised
> @@ -456,7 +456,8 @@ static void omap_8250_set_termios(struct uart_port *port,
>         up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
>
>         if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW &&
> -           !up->gpios) {
> +           !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_RTS) &&
> +           !mctrl_gpio_to_gpiod(up->gpios, UART_GPIO_CTS)) {
>                 /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
>                 up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
>                 priv->efr |= UART_EFR_CTS;
> --
> 2.17.1
>